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|
// +build linux darwin dragonfly solaris openbsd netbsd freebsd
package vt10x
import (
"bufio"
"bytes"
"io"
"unicode"
"unicode/utf8"
)
type terminal struct {
*State
}
func newTerminal(info TerminalInfo) *terminal {
t := &terminal{newState(info.w)}
t.init(info.cols, info.rows)
return t
}
func (t *terminal) init(cols, rows int) {
t.numlock = true
t.state = t.parse
t.cur.Attr.FG = DefaultFG
t.cur.Attr.BG = DefaultBG
t.Resize(cols, rows)
t.reset()
}
// Write parses input and writes terminal changes to state.
func (t *terminal) Write(p []byte) (int, error) {
var written int
r := bytes.NewReader(p)
t.lock()
defer t.unlock()
for {
c, sz, err := r.ReadRune()
if err != nil {
if err == io.EOF {
break
}
return written, err
}
written += sz
if c == unicode.ReplacementChar && sz == 1 {
if r.Len() == 0 {
// not enough bytes for a full rune
return written - 1, nil
}
t.logln("invalid utf8 sequence")
continue
}
t.put(c)
}
return written, nil
}
// TODO: add tests for expected blocking behavior
func (t *terminal) Parse(br *bufio.Reader) error {
var locked bool
defer func() {
if locked {
t.unlock()
}
}()
for {
c, sz, err := br.ReadRune()
if err != nil {
return err
}
if c == unicode.ReplacementChar && sz == 1 {
t.logln("invalid utf8 sequence")
break
}
if !locked {
t.lock()
locked = true
}
// put rune for parsing and update state
t.put(c)
// break if our buffer is empty, or if buffer contains an
// incomplete rune.
n := br.Buffered()
if n == 0 || (n < 4 && !fullRuneBuffered(br)) {
break
}
}
return nil
}
func fullRuneBuffered(br *bufio.Reader) bool {
n := br.Buffered()
buf, err := br.Peek(n)
if err != nil {
return false
}
return utf8.FullRune(buf)
}
func (t *terminal) Resize(cols, rows int) {
t.lock()
defer t.unlock()
_ = t.resize(cols, rows)
}
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